My biggest critique of this is that I couldn't see my grotesque creation in the end when I lost. I feel like the concept of this game lends itself to people wanting to view their creation (if for no other reason than to see where it went horribly wrong).
The controls are good, if a bit difficult (which is not necessarily an issue though), but the checkered boxes help with aligning things, which was nice. I would have liked to have something to aim towards (maybe like the stages you get in Tetris). Also, this might just be me, but I wasn't a huge fan of the colour palette in this -- it seems maybe a bit too random.
(Also, obligatory note on a variety of bugs, such as the settings button not working and the start button only working for the first time.)